Inkjet recording apparatus

Abstract

The inkjet recording apparatus includes: a supply manifold having an inlet port to which a first main flow channel is connected, the liquid supplied from a tank through the first main flow channel being stored in the supply manifold, the supply manifold being connected to supply ports of head modules; a collection manifold having an outlet port to which a second main flow channel is connected, the liquid to be collected to the tank through the second main flow channel being stored in the collection manifold, the collection manifold being connected to discharge ports of the head modules; and a first bypass flow channel which connects the supply manifold to the collection manifold, wherein an end of the first bypass flow channel is connected to an upper side of an end of the supply manifold on a side opposite to a side where the inlet port is arranged.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an inkjet recording apparatus, and more particularly to technology for circulating ink in a line head constituted of a plurality of head modules.[0003]2. Description of the Related Art[0004]An inkjet recording apparatus has a recording head (inkjet head) in which a plurality of nozzles are arranged on an ejection face, and records an image on a recording medium by ejecting ink droplets from the nozzles while moving the recording head and the recording medium relatively to each other. The ink ejection method of the recording head includes a piezoelectric method, which ejects an ink droplet from a nozzle by applying pressure to the ink inside a pressure chamber using the displacement of a piezoelectric element, and a thermal method, which ejects an ink droplet from a nozzle by means of the pressure generated when bubbles are produced inside a pressure chamber due to thermal energy produced...

AI Technical Summary

Benefits of technology

[0009]The present invention has been contrived in view of these circumstances, an object thereof being to provide an inkjet recording apparatus which is able to achieve stable ink circulation in a composition which employs sufficiently thick manifolds to achieve a large-volume circulation of ink to a line head constituted of a plurality of head modules while preventing bubbles from arriving at the head modules.

Problems solved by technology

Various technologies have been proposed for the recording heads of the inkjet recording apparatuses; however, in the line type apparatus, it is not practicable to form a single recording head that corresponds to the full width of the recording medium, as a single body, from a silicon wafer, glass, or the like, due to problems relating to the method of manufacture, the production yield, heat generation, cost, and the like.

In the inkjet recording apparatus, if bubbles are present in ink in flow channels inside the recording heads, then these can give rise to ejection defects, and the like, and hence the ink is circulated between the recording heads and a tank that is open to the air, and the bubbles are thereby collected in the tank and released into the air.

However, in Japanese Patent Application Publication No. 2007-069419, the object is to prevent stagnation of bubbles in the branching points between the main flow channel and the branch flow channels, but there is no investigation of the issue of using a manifold having a sufficient thickness in order to achieve a large-volume circulation of ink.

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